Two-part hair dye

ABSTRACT

A two-part hair dye composed of a first part containing an alkali agent, a second part containing hydrogen peroxide, and a non-aerosol foamer container for discharging a liquid mixture of the first part and the second part in the form of a foam, the liquid mixture containing the following components (A) and (B): (A) a polymer or copolymer containing 70% or more mole fraction of diallyldimethyl quaternary ammonium salt monomer, and (B) an N-acylamino acid salt, an N-acyl-N-alkylamino acid salt, or an ether carboxylic acid salt, wherein, an equivalent ratio of the anion site of the component (B) to the cation site of the component (A) (anion/cation) is more than 1, and a viscosity of the liquid mixture at 25° C. is 1 to 300 mPa·s.

FIELD OF THE INVENTION

The present invention relates to a two-part hair dye.

BACKGROUND OF THE INVENTION

Conventionally, a hair bleach product and a hair dye product are widelyavailable in the form of liquid or cream. However, it is difficult forthose who are not accustomed to using such a product to evenly apply itto the hair. This is because the viscosity of a mixture to be applied tothe hair is adjusted relatively high, namely, to approximately 1,000 to10,000 mPa·s, for prevention of dripping while the mixture is left onthe hair. This makes it difficult to evenly spread the mixture and toadequately cover the hair root with the mixture. Furthermore, skillssuch as blocking and two-mirror technique are necessary for applicationof the mixture to the hair root and the back of the head, also requiringmuch time.

In contrast, a non-aerosol type foamer container discharging a liquidmixture of a two-part hair bleach or a two-part hair dye containedtherein in the form of a foam is proposed (Patent Document 1). The abovehair bleach product or hair dye product discharges a liquid mixture ofthe first part and the second part from a non-aerosol type foamercontainer in the form of a foam, whereby the liquid mixture is evenlyapplied to the hair, resulting in an evenly-colored finish. The abovehair bleach product or hair dye product is particularly useful forresolving color differences between a newly-grown part and analready-dyed part. For these reasons, it is supported by a wide range ofcustomers, regardless of sex and age groups.

However, the two-part hair bleach and the two-part hair dye in the formof a foam of Patent Document 1 have various problems peculiar to theproduct in the form of a foam discharged from a non-aerosol type foamercontainer such as reduced foaming properties at low temperature. Also,because such a hair dye product has extremely lower viscosity in thestate of a liquid mixture as compared to a conventional liquid or cream(hereinbelow, referred to as “conventional type”) hair dye product,there has also been a limitation that a composition having good storagestability has to be designed. Furthermore, the two-part hair bleach andthe two-part hair dye in the form of a foam of Patent Document 1 tend tohave less sufficient fastness to shampooing than does a conventionaltype. This is considered to be attributable to the following reasons:because the hair dye product is applied to the hair in the form of afoam, the amount of the hair dye directly contributing to dyeing issmaller than the amount of the hair dye actually applied, and also,because the area of the air-liquid surface of the above product islarger than that of a conventional type, ammonia serving as an alkaliagent readily volatilizes, leading to an insufficient amount of thealkali agent for full penetration of the dye into the center of thehair.

In contrast, as a conventional type two-part hair dye, a two-part hairdye containing polyoxyalkylenated carboxylic acid ether or a saltthereof and a cationic polymer or an amphoteric polymer having no lessthan a certain level of cationic charge density is proposed (refer toPatent Document 2). According to this literature, the two-part hair dyedisclosed therein can impart a favorable hue. However, there is nodescription pertaining to a two-part hair dye provided in the form of afoam by using a non-aerosol type foamer container discharging a liquidmixture contained therein. Further, this literature is also totallyunsuggestive of a problem peculiar to the two-part hair dye in the formof a foam such as low foaming properties at low temperature and aproblem peculiar to a two-part hair dye prepared in the aforementionedform such as storage stability and fastness to shampooing.

Also, a less irritating shampoo composition containing alkyl etheracetate and a cationic polymer exhibiting excellent hair colorfading-preventing effects, foaming, smoothness when running fingersthrough the hair while shampooing, and smoothness during rinsing isproposed (Patent Document 3). However, this literature neither describesnor suggests the mole fraction of the cationic monomer in the cationicpolymer. Further, provided that this literature pertains to an inventionrelating to a shampoo composition, there is no question that it istotally silent on application to a hair dye product. In the first place,this invention relates to a technique to achieve prevention of colorfading of the hair dyed with a hair color by use of this shampoocomposition, and irrespective of the shampoo used, the technical ideaper se is entirely unrelated to provision of a hair dye productexcellent in fastness to shampooing.

-   [Patent Document 1] JP-A-2004-339216-   [Patent Document 2] JP-A-2003-192551-   [Patent Document 3] JP-A-2001-131034

SUMMARY OF THE INVENTION

The present invention provides a two-part hair dye which contains afirst part containing an alkali agent, a second part containing hydrogenperoxide, and a non-aerosol foamer container for discharging a liquidmixture of the first part and the second part in the form of a foam, theliquid mixture containing the following components (A) and (B):

(A) a polymer or copolymer containing 70% or more mole fraction ofdiallyldimethyl quaternary ammonium salt monomer, and

(B) an N-acylamino acid salt, an N-acyl-N-alkylamino acid salt, or anether carboxylic acid salt,

wherein, an equivalent ratio of the anion site of the component (B) tothe cation site of the component (A) (anion/cation) is more than 1, anda viscosity of the liquid mixture at 25° C. is 1 to 300 mPa·s.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a two-part hair dye provided in theform of a foam by using a non-aerosol foamer container. This hair dyeproduct has good storage stability and dyeability, while takingadvantage of the merit of the two-part hair dye in the form of a foamdescribed in Patent Document 1. After dyeing, the hair dye productexhibits excellent fastness also to shampooing, which is said to belikely to cause color fading.

The present inventors found that the aforementioned problems can beresolved by using a polymer or copolymer containing not less than acertain ratio of diallyldimethyl quaternary ammonium salt monomer incombination with a specific anionic surfactant.

[(A): Polymer or Copolymer Containing 70% or More Mole Fraction ofDiallyldimethyl Quaternary Ammonium Salt Monomer]

The polymer or copolymer of Component (A) improves fastness toshampooing by separation of complexes formed when a liquid mixture ofthe first part and the second part is diluted with water throughinteraction with Component (B). In view of the above, the mole fractionof the diallyldimethyl quaternary ammonium salt monomer needs to be notless than 70%. The mole fraction is more preferably not less than 80%,and even more preferably not less than 90%. In the case of a copolymer,no limitation is imposed on other monomers as long as they arecopolymerizable; however, they preferably contain acrylic acid oracrylamide. Examples of such a polymer or copolymer include, as acommercially available product, Merquat 100 (mole fraction: 100%) andMerquat 295 (mole fraction: 95%) (the products of Nalco Company).

The content of Component (A) in a liquid mixture of the first part andthe second part is preferably 0.1 to 1.5 mass %, more preferably 0.15 to1.2 mass %, and even more preferably 0.2 to 1 mass %. Also, the cationicpolymer or the amphoteric polymer of Component (A) may be contained ineither the first part or the second part.

[(B): N-Acylamino Acid Salt, N-Acyl-N-Alkylamino Acid Salt, or EtherCarboxylic Acid Salt]

The N-acylamino acid salt, the N-acyl-N-alkylamino acid salt, or theether carboxylic acid salt of Component (B) improves fastness toshampooing through complexes formed by interaction with Component (A)when a liquid mixture of the first part and the second part is dilutedwith water.

At this point, examples of an amino acid residue of the N-acylamino acidsalt include glutamic acid and aspartic acid, and examples of an aminoacid residue of the N-acyl-N-alkylamino acid salt include glutamic acid,glycine, and β-alanine. Also, examples of an alkyl group of theN-acyl-N-alkylamino acid salt include a methyl group, an ethyl group, apropyl group, and an isopropyl group. Also, examples of an acyl groupinclude a lauroyl group, a myristoyl group, and a palmitoyl group, andexamples of the N-acylamino acid salt and the N-acyl-N-alkylamino acidsalt include a sodium salt, a potassium salt, a lithium salt, anethanolamine salt, a diethanolamine salt, and a triethanolamine salt(hereinbelow, abbreviated as TEA). Preferred specific examples of theN-acylamino acid salt include N-lauroyl glutamate, N-myristoylglutamate, N-stearoyl glutamate, N-cocoyl glutamate, and N-hydrogenatedtallow glutamate, and preferred specific examples of theN-acyl-N-alkylamino acid salt include an N-lauroyl-N-isopropyl glycinesalt, an N-lauroyl sarcosine salt, an N-myristoyl sarcosine salt, anN-palmitoyl sarcosine salt, and an N-lauroyl-N-methyl-β-alanine salt.

Examples of the ether carboxylic acid salt include a polyglyceryl alkylether acetic acid salt or an ether acetic acid salt represented by thefollowing general formula (1):R—Z—(CH₂CH₂O)_(m)—CH₂CO₂X  (1)

wherein, R represents a linear or branched alkyl group or alkenyl grouphaving a carbon number of 7 to 19, Z represents —O— or —CONH—, Xrepresents a hydrogen atom, an alkali metal, triethanolamine, orammonium, and m represents a number of 1 to 20.

In the aforementioned ether acetic acid salt, the carbon number of R ispreferably 11 to 15. Also, m is preferably 3 to 15, more preferably 6 to12. Specific examples thereof include polyoxyethylene (10) lauryl etheracetic acid (in the general formula (1), R═C₁₂H₂₅, Z═—O—, m=10),polyoxyethylene (8) myristyl ether acetic acid (in the general formula(1), R═C₁₄H₂₉, Z═—O—, m=8), lauric acid amide polyoxyethylene (6) etheracetic acid (in the general formula (1), R═C₁₁H₂₃, Z═—CONH—, m=6), andlauric acid amide polyoxyethylene (10) ether acetic acid (in the generalformula (1), R═C₁₁H₂₃, Z═—CONH—, m=10). Also, the degree ofneutralization of the ether acetic acid salt is preferably 60 to 120%,and the counter ion X is preferably an alkali metal, more preferablypotassium. Examples of the ether acetic acid salt include apolyoxyethylene tridecyl ether acetic acid salt and a polyoxyethylenelauryl ether acetic acid salt, and examples of the salt thereof includea sodium salt and a potassium salt.

The content of Component (B) in a liquid mixture of the first part andthe second part is preferably 0.5 to 5 mass %, more preferably 0.7 to4.5 mass %, and even more preferably 1 to 3.5 mass %. Also, theN-acylamino acid salt, the N-acyl-N-alkylamino acid salt, or the ethercarboxylic acid salt of Component (B) may be contained in either thefirst part or the second part, regardless of whether Component (A) iscontained in the first part or the second part.

[Ratio of Component (B) to Component (A)]

The ratio of Component (B) to Component (A) in a liquid mixture of thefirst part and the second part is adjusted such that the equivalentratio of the anion site of the component (B) to the cation site of thecomponent (A) (anion/cation) is more than 1, taking into considerationthat the content is stably present without separation when the firstpart and the second part are mixed, while it separates when the mixtureis diluted with water. Further, the ratio of Component (B) to Component(A) is preferably adjusted such that the equivalent ratio is 1.1 to 20,more preferably 1.2 to 10.

[Alkali Agent]

The first part contains an alkali agent. Examples of the alkali agentinclude ammonia and a salt thereof; alkanolamine such asmonoethanolamine, isopropanolamine, 2-amino-2-methyl propanol, and2-aminobutanol, and a salt thereof; alkanediamine such as1,3-propanediamine and a salt thereof; and carbonate such as guanidinecarbonate, sodium carbonate, potassium carbonate, sodium bicarbonate,and potassium bicarbonate. Two or more of these alkali agents may beused in combination, and the content thereof in a liquid mixture ispreferably 0.05 to 15 mass %, more preferably 0.1 to 10 mass %, and evenmore preferably 0.2 to 5 mass %, from the viewpoints of adequate hairdyeing and bleaching effects and reduced hair damage and scalpirritation.

[Hydrogen Peroxide]

The content of hydrogen peroxide in the second part is preferably 1 to 9mass %, more preferably 3 to 6 mass %, and the content of hydrogenperoxide in a liquid mixture of the first part and the second part ispreferably 1 to 6 mass %, more preferably 2 to 5 mass %. Also, the pH ofthe second part is preferably 2 to 6, more preferably 2.5 to 4 in orderto prevent decomposition of hydrogen peroxide.

[Dye]

The two-part hair dye of the present invention contains an oxidation dyeintermediate or a direct dye in the first part.

(Oxidation Dye Intermediate)

Publicly known precursors and couplers normally used in a hair dyeproduct can be used as the oxidation dye intermediate. Examples of theprecursor include para-phenylenediamine, toluene-2,5-diamine,2-chloro-para-phenylenediamine, N-methoxyethyl-para-phenylenediamine,N,N-bis(2-hydroxyethyl)-para-phenylenediamine,2-(2-hydroxyethyl)-para-phenylenediamine,2,6-dimethyl-para-phenylenediamine, 4,4′-diaminodiphenylamine,1,3-bis(N-(2-hydroxyethyl)-N-(4-aminophenyl)amino)-2-propanol,PEG-3,3,2′-para-phenylenediamine, para-aminophenol,para-methylaminophenol, 3-methyl-4-aminophenol,2-aminomethyl-4-aminophenol,2-(2-hydroxyethylaminomethyl)-4-aminophenol, ortho-aminophenol,2-amino-5-methylphenol, 2-amino-6-methylphenol, 2-amino-5-acetamidephenol, 3,4-diaminobenzoic acid, 5-aminosalicylic acid,2,4,5,6-tetraminopyrimidine, 2,5,6-triamino-4-hydroxypyrimidine,4,5-diamino-1-(4′-chlorobenzyl)pyrazole,4,5-diamino-1-hydroxyethylpyrazole, and salts of these substances.

Also, examples of the coupler include meta-phenylenediamine,2,4-diaminophenoxyethanol, 2-amino-4-(2-hydroxyethylamino)anisole,2,4-diamino-5-methylphenetole, 2,4-diamino-5-(2-hydroxyethoxy)toluene,2,4-dimethoxy-1,3-diaminobenzene, 2,6-bis(2-hydroxyethylamino)toluene,2,4-diamino-5-fluorotoluene, 1,3-bis(2,4-diaminophenoxy)propane,meta-aminophenol, 2-methyl-5-aminophenol,2-methyl-5-(2-hydroxyethylamino)phenol, 2,4-dichloro-3-aminophenol,2-chloro-3-amino-6-methylphenol, 2-methyl-4-chloro-5-aminophenol,N-cyclopentyl-meta-aminophenol,2-methyl-4-methoxy-5-(2-hydroxyethylamino)phenol,2-methyl-4-fluoro-5-aminophenol, resorcin, 2-methylresorcin,4-chlororesorcin, 1-naphthol, 1,5-dihydroxynaphthalene,1,7-dihydroxynaphthalene, 2,7-dihydroxynaphthalene,2-isopropyl-5-methylphenol, 4-hydroxyindole, 5-hydroxyindole,6-hydroxyindole, 7-hydroxyindole, 6-hydroxybenzomorpholine,3,4-methylenedioxyphenol, 2-bromo-4,5-methylenedioxyphenol,3,4-methylenedioxyaniline,1-(2-hydroxyethyl)amino-3,4-methylenedioxybenzene,2,6-dihydroxy-3,4-dimethylpyridine, 2,6-dimethoxy-3,5-diaminopyridine,2,3-diamino-6-methoxypyridine, 2-methylamino-3-amino-6-methoxypyridine,2-amino-3-hydroxypyridine, 2,6-diaminopyridine, and salts of thesesubstances.

Two or more of each of the precursor and the coupler can be used incombination, and the content of each of them in the liquid mixture ispreferably 0.01 to 5 mass %, more preferably 0.1 to 4 mass %.

(Direct Dye)

Examples of the direct dye include an acid dye, a nitro dye, a dispersedye, and a basic dye. Examples of the acid dye include Blue No. 1,Violet No. 401, Black No. 401, Orange No. 205, Red No. 227, Red No. 106,Yellow No. 203, and Acid orange No. 3. Examples of the nitro dye include2-nitro-p-phenylenediamine, 2-amino-6-chloro-4-nitrophenol,3-nitro-p-hydroxyethylaminophenol, 4-nitro-o-phenylenediamine,4-amino-3-nitrophenol, 4-hydroxypropylamino-3-nitrophenol, HC Blue No.2, HC Orange No. 1, HC Red No. 1, HC Yellow No. 2, HC Yellow No. 4, HCYellow No. 5, HC Red No. 3, andN,N-bis(2-hydroxyethyl)-2-nitro-p-phenylenediamine. Examples of thedisperse dye include Disperse Violet 1, Disperse Blue 1, and DisperseBlack 9. Examples of the basic dye include Basic Blue 99, Basic Brown16, Basic Brown 17, Basic Red 76, Basic Red 51, Basic Yellow 57, BasicYellow 87, and Basic Orange 31.

Two or more of the direct dye may be used in combination, and the directdye may be used in combination with the oxidation dye intermediate.Also, the content of the direct dye in the liquid mixture is preferably0.001 to 5 mass %, more preferably 0.01 to 3 mass %.

[Surfactant]

In order to impart good storage stability to the two-part hair dye ofthe present invention and allow easy formation of a stable foam throughmixing of air and a hair cosmetic by foam discharge means of a foamercontainer, a surfactant other than Component (B) can be further added toeither one or both of the first part and the second part. As thesurfactant other than Component (B), any one of an anionic surfactant, acationic surfactant, an amphoteric surfactant, and a nonionic surfactantother than Component (B) can be used.

Examples of the anionic surfactant other than Component (B) include asulfuric acid ester surfactant such as alkyl sulfate and alkyl ethersulfate; a carboxylic acid surfactant such as a fatty acid salt, alkylsuccinate, and alkenyl succinate; a phosphoric acid ester surfactantsuch as alkyl phosphate and alkyl ether phosphate; and a sulfonic acidsurfactant such as sulfosuccinate, isethionate, a taurine salt,alkylbenzenesulfonic acid, α-olefin sulfonic acid, and alkanesulfonicacid. Preferred examples of the anionic surfactant other than Component(B) include alkyl sulfate and polyoxyalkylene alkyl sulfate, and thecarbon number of the alkyl group of these surfactants is preferably 10to 24, more preferably 12 to 18, and the alkyl group is preferablylinear. Also, polyoxyalkylene alkyl sulfate is preferable, especiallypolyoxyethylene alkyl sulfate is more preferable. The average additionmole number of the oxyethylene group of the polyoxyalkylene alkylsulfate is preferably 1 to 10, more preferably 2 to 5.

The cationic surfactant is preferably a mono long-chain alkyl quaternaryammonium salt. Specific examples thereof include cetrimonium chloride,steartrimonium chloride, behentrimonium chloride, stearalkoniumchloride, and benzalkonium chloride. Among these, steartrimoniumchloride and behentrimonium chloride are more preferable. Examples of acommercially available cationic surfactant include QUARTAMIN 86W,QUARTAMIN 86P CONC, QUARTAMIN 60W, and QUARTAMIN D2345P (the products ofKao Corporation), and NIKKOL CA-2580 (the product of Nihon SurfactantKogyo K.K.).

Examples of the amphoteric surfactant include carbobetaine,amidobetaine, sulfobetaine, hydroxyl sulfobetaine, amidosulfobetaine,phospho-betaine, and imidazolinium surfactants having an alkyl group, analkenyl group, or an acyl group with a carbon number of 8 to 24. Amongthem, a carbobetaine surfactant and a sulfobetaine surfactant arepreferable. Preferred examples of the amphoteric surfactant includelauric acid amidopropyl betaine, coconut oil fatty acid amidopropylbetaine, lauryldimethylaminoacetic acid betaine, andlaurylhydroxysulfobetaine.

Examples of the nonionic surfactant include an alkyl polyglucoside, apolyoxyalkylene alkyl ether, and an alkyl glyceryl ether. The carbonnumber of the alkyl group of the alkyl polyglucoside is preferably 8 to18, more preferably 8 to 14, and even more preferably 9 to 11, and thealkyl group is preferably linear. The average degree of condensation ofthe glucoside is preferably 1 to 5, more preferably 1 to 2. The carbonnumber of the alkyl group of the polyoxyalkylene alkyl ether ispreferably 10 to 22, more preferably 12 to 18, and the alkyl group ispreferably linear. Also, the polyoxyethylene alkyl ether is morepreferable, and especially the average addition mole number of theoxyethylene group of the polyoxyethylene alkyl ether is preferably 1 to40, more preferably 4 to 30. The carbon number of the alkyl group of thealkyl glyceryl ether is preferably 8 to 18, more preferably 8 to 12, andthe alkyl group is preferably branched.

Two or more of these surfactants other than Component (B) can be used incombination.

The content of the anionic surfactant other than Component (B) or thecationic surfactant in a liquid mixture of the first part and the secondpart is preferably 0 to 1 mass %, more preferably 0 to 0.8 mass %, andeven more preferably 0 to 0.6 mass % so as not to affect the interactionbetween Component (A) and Component (B).

Also, the content of the amphoteric surfactant or the nonionicsurfactant in a liquid mixture of the first part and the second part ispreferably 0.1 to 5 mass %, more preferably 0.5 to 4 mass %, and evenmore preferably 1 to 3 mass %.

[Oil Agent]

From the viewpoint of stabilization of the foam of the liquid mixturedischarged, the two-part hair dye of the present invention can furthercontain an oil agent. Examples of the oil agent include hydrocarbonssuch as squalene, squalane, liquid paraffin, liquid isoparaffin, andcycloparaffin; glycerides such as castor oil, cacao oil, mink oil,avocado oil, and olive oil; waxes such as bees wax, whale wax, lanoline,and carnauba wax; esters such as isopropyl palmitate, isopropylmyristate, octyldodecyl myristate, hexyl laurate, cetyl lactate,propylene glycol monostearate, oleyl oleate, hexadecyl 2-ethylhexanoate,isononyl isononanoate, and tridecyl isononanoate; higher fatty acidssuch as capric acid, lauric acid, myristic acid, palmitic acid, stearicacid, behenic acid, oleic acid, coconut fatty acid, isostearic acid, andisopalmitic acid; higher alcohols such as myristyl alcohol, cetylalcohol, stearyl alcohol, behenyl alcohol, 2-octyldodecanol, andcetostearyl alcohol; and further, isostearyl glyceryl ether andpolyoxypropylene butyl ether. Among them, higher alcohols arepreferable, of which myristyl alcohol, cetyl alcohol, and stearylalcohol are preferable.

The content of the oil agent in a liquid mixture of the first part andthe second part is preferably 0.01 to 3 mass %, more preferably 0.03 to2.5 masse, and even more preferably 0.05 to 2 mass %.

[Silicones]

From the viewpoint of long-time retention of the discharged foam, aliquid mixture of the first part and the second part of the two-parthair dye of the present invention preferably does not contain silicone.However, for smooth blending of foam into the hair and impartation ofhigh conditioning effects to the hair, silicones can be further addedwithin a certain range. Examples of the silicones includedimethylpolysiloxane, methylphenylpolysiloxane, polyether-modifiedsilicone, amino-modified silicone, oxazoline-modified siliconeelastomer, and emulsions of these silicones dispersed with a surfactantin water. Among them, polyether-modified silicone, amino-modifiedsilicone, and emulsions of these silicones are preferable as they canstably disperse in water without using a viscosity enhancer.

The polyether-modified silicone includes end-modified silicone and sidechain-modified silicone, for example, pendant-type (comb-type) silicone,both end-modified silicone, and one end-modified silicone. Examples ofthe modified silicone include adimethylsiloxane-methyl(polyoxyethylene)siloxane copolymer, adimethylsiloxane-methyl(polyoxypropylene)siloxane copolymer, and adimethylsiloxane-methyl(polyoxyethylene-polyoxypropylene)siloxanecopolymer. The polyether-modified silicone has an HLB of preferably 10or higher, more preferably 10 to 18, in view of compatibility withwater. Here, HLB is a value obtained from a phenol index (phenol index:an index correlated with HLB, applicable to an ether type nonionicsurfactant).

Amino-modified silicone having an amino group or an ammonium group maybe used as the amino-modified silicone, and amodimethicone is preferred.

When silicones are added to a liquid mixture of the first part and thesecond part, the content thereof is preferably no more than 2 mass %,more preferably 0.005 to 1 mass %, even more preferably 0.01 to 0.5 mass% for smooth blending of foam into the hair without impairing foamingproperties, and for impartation of high conditioning effects to thehair.

[Solvent]

As a solvent, water and, if needed, an organic solvent are used in thetwo-part hair dye of the present invention. Examples of the organicsolvent include lower alkanols such as ethanol and 2-propanol; aromaticalcohols such as benzylalcohol and benzyloxyethanol; polyols such aspropylene glycol, 1,3-butanediol, diethylene glycol, and glycerin;cellosolves such as ethyl cellosolve, butyl cellosolve, and benzylcellosolve; and carbitols such as ethyl carbitol and butyl carbitol.

[Other Arbitrary Components]

Besides the ones mentioned above, other components routinely used ascosmetic ingredients can be added to the two-part hair dye of thepresent invention. Examples of such an arbitrary component includeanimal and plant oil and fat, natural or synthetic polymers, ethers,protein derivatives, protein hydrolysate, amino acids, preservatives,chelating agents, stabilizers, antioxidants, plant extracts, crude drugextracts, vitamins, fragrance, and ultraviolet ray absorbers.

[pH]

The pH (25° C.) of the two-part hair dye of the present invention ispreferably 8 to 12, more preferably 9 to 11, and even more preferably 9to 10 upon application (at the time of mixing) in view of bleaching andhair dyeing effects and skin irritation. Examples of a pH adjusterinclude, besides the aforementioned alkali agent, an inorganic acid suchas hydrochloric acid and phosphoric acid; an organic acid such as citricacid, glycolic acid, and lactic acid; and a phosphoric acid salt such asmonopotassium dihydrogen phosphate and disodium monohydrogen phosphate.

[Viscosity]

The viscosity of a liquid mixture of the first part and the second partis 1 to 300 mPa·s, preferably 5 to 200 mPa·s, more preferably 10 to 100mPa·s. Herein, the measurement of viscosity is taken at a revolutionspeed of 60 rpm, 30 rpm, or 12 rpm for a subject of measurement having aviscosity of no more than 100 mPa·s, 100 to 200 mPa·s, or no less than200 mPa·s, respectively, at 25° C. by a B-type rotational viscometerwith rotor No. 1. Measurements are taken in the order of high revolutionto low revolution, and the measurement is completed at the point whenthe measurement is taken without the indicator swinging past the maximumpoint. No further measurements are subsequently taken at lowerrevolutions.

As the viscosity of a liquid mixture of the first part and the secondpart is adjusted to be in the aforementioned range, easily-applicablefoam volume can be realized and dripping of the liquid mixture appliedto the hair can be prevented, while squeezing to discharge a foam from asqueeze foamer and the like becomes easy. In order to adjust theviscosity of the liquid mixture to the aforementioned range, awater-soluble solvent such as ethanol may be added, or the content andthe kind of the surfactant, the polyols, the higher alcohol, and thelike may be appropriately adjusted.

[Gas-Liquid Mixing Ratio]

The gas-liquid mixing ratio of air and the liquid mixture achieved bythe foam discharge means of the foamer container is preferably 7 to 40mL/g, more preferably 15 to 30 mL/g, in view of easy blending of thepreparation into the hair and easy application. The gas-liquid mixingratio referred to herein is a value measured as follows.

Firstly, the weight and the volume of a foam discharged at 25° C. aremeasured to obtain a gas-liquid mixing ratio. Into a squeeze foamer(Daiwa Can Company, a volume of 210 mL, the coarseness (aperture) of amesh in a mixing chamber is 150 mesh (150 openings per inch (25.4 mm)),and that of a mesh closest to the discharge outlet is 200 mesh), 100 gof the liquid mixture is placed. Once the amount of remaining foam hasreached 80 g, 20 g of foam is discharged into a 1000 mL graduatedcylinder, and the volume of foam thus discharged is measured one minuteafter initiation of discharging. The volume of discharged foam thusobtained (mL) is divided by a weight of 20 g to give a gas-liquid mixingratio (mL/g).

[Foamer Container]

In the present invention, a foamer container is a non-aerosol typecontainer, which is used to discharge a liquid mixture of the first partand the second part in the form of a foam by mixing it with air withoutusing a propellant. A preventive effect on spattering of dischargedpreparation can also be attained with use of a foamer container.Particularly, a non-aerosol type container can be produced at a lowercost than an aerosol type container, and it can be handled more safelyduring distribution as no high-pressure gas propellant needs to be used.

As the foamer container, a publicly-known pump foamer container withfoam discharge means, a squeeze foamer container, an electric foamer, anaccumulator pump foamer container, and the like can be used. Specificexamples thereof include pump foamer E3 type, pump foamer F2 type (theproducts of Daiwa Can Company), a squeeze foamer (Daiwa Can Company), anelectric foamer (Matsushita Electric Works, Ltd.), and an air sprayfoamer (Airspray International, Inc.) described in FOOD & PACKAGING(vol. 35, No. 10, pages 588 to 593 (1994); vol. 35, No. 11, pages 624 to627 (1994); vol. 36, No. 3, pages 154 to 158 (1995)). As the foamercontainer to be used for the two-part hair dye of the present invention,a pump foamer container and a squeeze foamer container are preferable asthey are inexpensive and can be handled easily.

A pump foamer container or a squeeze foamer container has a foam-formingunit such as a net. It preferably has a thin net so that, in a case thata liquid mixture of the first part and the second part is dried andsolidified to cause clogging, the flow of foam generated by the nextdischarging immediately dissolves the solidified mass to resolve theclogging. In this case, the mesh of the net is preferably 50 to 280mesh, more preferably 90 to 250 mesh, and even more preferably 130 to220 mesh. Here, a mesh refers to the number of apertures per inch. Useof the net of the mesh within the above range enables formation of acreamy foam. Also, preferred examples of the material of the meshinclude nylon and polyester.

In the foamer container used in the two-part hair dye of the presentinvention, it is preferable to set at least one sheet, preferably morethan one sheets of such a net. Particularly, in view of economicefficiency, foam stability, and the like, it is preferable to set twosheets of such a net.

The part of the foamer container which is in contact with the content(the inner wall of the container, the inner wall of the foam dischargemeans, and the like) is preferably composed of a material resistant tocorrosion by alkali and hydrogen peroxide while allowing permeation ofoxygen generated by decomposition of hydrogen peroxide.

As the product form of the two-part hair dye of the present inventioncomposed of the first part, the second part, and the foamer container,the first part and the second part may each be contained in containersseparate from the foamer container, and they may be transferred to thefoamer container and mixed upon application. Alternatively, one of thepreparations is contained in the foamer container while the other iscontained in a separate container, and the preparation in the separatecontainer may be transferred to the foamer container upon application.In this case, the second part is contained in a gas-permeable container,especially a foamer container composed of an oxygen-permeable material(for example, polyethylene) for prevention of an increase in thepressure inside the container due to oxygen generated by decompositionof hydrogen peroxide. Meanwhile, a container though which oxygen hardlypermeates needs to be used for the first part for prevention ofoxidation of the oxidation dye.

[Application Method]

In order to dye or bleach the hair (particularly, the hair of the head)with the two-part hair dye of the present invention, the hair ispreferably combed in advance. Because the hair becomes less likely toget tangled by combing during the re-foaming treatment to be describedbelow, there is no fear of splattering of the liquid mixture. Further,after combing the hair, blocking needs not to be performed, which isusually performed in application of a hair dye composition. Furthermore,blocking is preferably not performed. Absence of blocking makes thebelow-described operation of application of a hair dye composition tothe hair and re-foaming operation easy. Subsequently, the first part andthe second part of the two-part hair dye of the present invention aremixed in the foamer container. The preparation discharged in the form ofa foam from the container may be applied to the hair directly or using atool such as hands or a brush. From the viewpoint of prevention ofsplattering and dripping of the preparation, the preparation ispreferably discharged in (gloved) hands first, and then applied to thehair.

After application, the hair dye product is left on the hair forapproximately 3 to 60 minutes, preferably approximately 5 to 45 minutes.At this time, from the viewpoints of ensuring prevention of drippingwhile the hair dye product is left on the hair and adequately coveringalso the hair root with the liquid mixture, the hair dye product ispreferably re-foamed on the hair. For re-foaming, gas may be infused, atool such as a vibrating device and a brush or fingers may be used, andfingers are more preferably used.

At this point, re-foaming may be performed after complete disappearanceof the foam, during disappearance of the foam, or before the foamapplied undergoes changes. Alternatively, re-foaming may be performedafter completion of application of the foam to the entire range of areasto which the hair dye product is intended to be applied or duringapplication. Re-foaming may be performed continuously once orintermittently repeated multiple times.

After these operations, the liquid mixture is rinsed off. Subsequently,the hair is appropriately shampooed and conditioned, and then rinsedwith water, followed by drying.

EXAMPLES Examples 1 to 8, Comparative Examples 1 to 5

The first part and the second part having compositions as shown inTables 1 and 2 (mass %) were prepared, which were mixed at a ratio of1:1.5 to prepare a liquid mixture. Four tresses of Chinese white hairmanufactured by Beaulax Co., Ltd., each weighing 1 g and being 10 cm inlength, were prepared for each Example and Comparative Example.

The liquid mixture of 30° C. was discharged in the form of a foam from asqueeze foamer (S1 squeeze foamer manufactured by Daiwa Can Company, avolume of 210 mL, the coarseness of a mesh in a mixing chamber is 150mesh and that of a mesh closest to the discharge outlet is 200 mesh, thetotal area of the narrowest opening of an air induction passage is 0.27mm², and the inner diameter of a dip tube is 1.7 mm). The foam of theliquid mixture was applied to the hair in a ratio of 1 to 1, and thenleft for 30 minutes. Subsequently, the four tresses were immersed in 100mL of ion exchange water all together, and left for one minute. Then,the tresses were shampooed using a shampoo shown below and dried, whichserved as evaluation samples of pre-shampooed hair.

The value of color difference ΔE₀ from before hair dyeing was measuredin the evaluation samples thus obtained with a colorimeter CR-400manufactured by Konica Minolta Sensing, Inc. Two tresses with median ΔE₀values were used in the following tests. The evaluation samples wereeach tress placed in a test tube NS-10 manufactured by As OneCorporation. The tubes were adequately filled with a 10-fold dilutedsolution of the shampoo shown below and sealed. Subsequently, thesamples were treated at 40° C. and a shaking speed of 120 rpm using awater bath shaker MM-10 manufactured by TAITEC Corporation for 30minutes. After treatment, the tresses were rinsed with water and dried,which served as evaluation samples of shampooed hair. The value of colordifference ΔE₁ from before hair dyeing was measured also in theevaluation samples of shampooed hair with the aforementionedcolorimeter. Fastness to shampooing was evaluated according to thefollowing evaluation criteria.

(Evaluation Method)

Comparing the difference between ΔE₀ before shampooing and ΔE₁ aftershampooing (ΔE₀−ΔE₁) with that of Comparative Example 4 (standard;(ΔE₀−ΔE₁=4.5)), the following evaluation was made:

a: smaller by 1 or greater

b: smaller by 0.5 to 1

c: equivalent (within ±0.5)

d: larger by 0.5 or greater

(Shampoo Used for Evaluation)

Sodium POE (3) lauryl ether sulfate 15.5 mass % Lauric aciddiethanolamide 1.5 mass % Tetrasodium edetate 0.3 mass % Sodium benzoate1.43 mass % Ion exchange water Balance(Foaming Properties at Low Temperature)

The first part and the second part having compositions as shown inTables 1 and 2 were each sealed in containers and left in a constanttemperature room at 5° C. for 24 hours. Subsequently, immediately aftertransferring these preparations to a room at 20° C., the first part andthe second part were mixed at a mixing ratio (mass ratio) of 1:1.5 inthe aforementioned squeeze foamer. The liquid mixture was thendischarged in the form of a foam and observed for its foamingproperties.

a: extremely uniform and fine foam

b: uniform and fine foam

c: ununiform and coarse foam

d: watery and cannot form a foam

(Storage Stability)

The first part and the second part having compositions as shown inTables 1 and 2 were each sealed in containers and left in a constanttemperature room at −5° C. for one month. Subsequently, the preparationswere visually evaluated according to the following criteria.

a: no change was observed

b: slight turbidity was observed

c: white turbidity was observed

d: precipitation formed

TABLE 1 Example (mass %; the content entirely represents the activeamount) 1 2 3 4 5 6 7 8 First toluene-2,5-diamine 0.50 0.50 0.50 0.500.50 0.50 0.50 0.50 part resorcinol 0.40 0.40 0.40 0.40 0.40 0.40 0.400.40 meta-aminophenol 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 (B) sodiumpolyoxyethylene (5) lauryl ether acetate — — — — — 8.46 2.82 1.18 (B)sodium cocoylglutamate 9.60 7.20 7.20 7.20 2.40 — — 6.00 (B)′ sodiumpolyoxyethylene lauryl ether sulfate (2.0 E.O.) — — — — — — — — alkyl (8to 16) glucoside 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 polyoxyethylenelauryl ether (23 E.O.) 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00polyoxyethylene (9) tridecyl ether 0.50 0.50 0.50 0.50 0.50 0.50 0.500.50 propylene glycol 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 ethanol9.50 9.50 9.50 9.50 9.50 9.50 9.50 9.50 (A) dimethyldiallylammoniumchloride-acrylic acid 3.20 1.20 1.20 0.40 0.40 1.20 0.40 1.20 copolymer(*1) (A)′ dimethyldiallylammonium chloride-acrylic acid — — — — — — — —copolymer (*2) (A)′ dimethyldiallylammonium chloride-acrylamide — — — —— — — — copolymer (*3) ammonia 1.68 1.68 1.68 1.68 1.68 1.68 1.68 1.68ammonium bicarbonate 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00monoethanolamine 2.40 2.40 2.40 2.40 2.40 2.40 2.40 2.40 ascorbic acidq.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. anhydrous sodium sulfite q.s.q.s. q.s. q.s. q.s. q.s. q.s. q.s. tetrasodium edetate dihydrate q.s.q.s. q.s. q.s. q.s. q.s. q.s. q.s. purified water in an amount thatbrings the total amount balance balance balance balance balance balancebalance balance of the first part to 100 Second stearyltrimethylammoniumchloride 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 part polyoxyethylene(40) cetyl ether 0.46 0.46 0.46 0.46 0.46 0.46 0.46 0.46 cetanol 0.740.74 0.74 0.74 0.74 0.74 0.74 0.74 myristyl alcohol 0.21 0.21 0.21 0.210.21 0.21 0.21 0.21 hydroxyethanediphosphonic acid 0.04 0.04 0.04 0.040.04 0.04 0.04 0.04 oxyquinoline sulfate (2) 0.04 0.04 0.04 0.04 0.040.04 0.04 0.04 sodium hydroxide or phosphoric acid *4 *4 *4 *4 *4 *4 *4*4 hydrogen peroxide 5.70 5.70 5.70 5.70 5.70 5.70 5.70 5.70 purifiedwater in an amount that brings the total amount balance balance balancebalance balance balance balance balance of the second part to 100anion/cation equivalent ratio of Component (B)/Component (A) 1.24 1.242.49 2.49 2.49 2.50 2.50 2.42 viscosity of the liquid mixture (25° C.,mPa · s) 22 17 15 15 11 17 12 16 evaluation fastness to shampooing basedon Comparative Example 4 a a a a a a a a (a number in parenthesisrepresents ΔE₀-ΔE₁ (3.0) (2.9) (3.4) (3.0) (2.9) (3.4) (2.4) (3.1) ofeach Example) foaming properties at low temperature a a a a a a a astorage stability a a a a a a a a

TABLE 2 Comparative Example (mass %; the content entirely represents theactive amount) 1 2 3 4 5 First toluene-2,5-diamine 0.50 0.50 0.50 0.500.50 part resorcinol 0.40 0.40 0.40 0.40 0.40 meta-aminophenol 0.10 0.100.10 0.10 0.10 (B) sodium polyoxyethylene (5) lauryl ether acetate —8.46 1.18 1.18 — (B) sodium cocoylglutamate 7.20 — 6.00 6.00 7.20 (B)′sodium polyoxyethylene lauryl ether sulfate (2.0 E.O.) — — — — — alkyl(8 to 16) glucoside 2.00 2.00 2.00 2.00 2.00 polyoxyethylene laurylether (23 E.O.) 2.00 2.00 2.00 2.00 2.00 Polyoxyethylene (9) tridecylether 0.50 0.50 0.50 0.50 0.50 propylene glycol 4.00 4.00 4.00 4.00 4.00ethanol 9.50 9.50 9.50 9.50 9.50 (A) dimethyldiallylammoniumchloride-acrylic acid copolymer (*1) — 3.20 — — — (A)′dimethyldiallylammonium chloride-acrylic acid copolymer (*2) — — — 1.20— (A)′ dimethyldiallylammonium chloride-acrylamide copolymer (*3) — — —— 0.51 ammonia 1.68 1.68 1.68 1.68 1.68 ammonium bicarbonate 8.00 8.008.00 8.00 8.00 monoethanolamine 2.40 2.40 2.40 2.40 2.40 ascorbic acidq.s. q.s. q.s. q.s. q.s. anhydrous sodium sulfite q.s. q.s. q.s. q.s.q.s. tetrasodium edetate dihydrate q.s. q.s. q.s. q.s. q.s. purifiedwater in an amount that brings the total amount of the balance balancebalance balance balance first part to 100 Secondstearyltrimethylammonium chloride 0.70 0.70 0.70 0.70 0.70 partpolyoxyethylene (40) cetyl ether 0.46 0.46 0.46 0.46 0.46 cetanol 0.740.74 0.74 0.74 0.74 myristyl alcohol 0.21 0.21 0.21 0.21 0.21hydroxyethanediphosphonic acid 0.04 0.04 0.04 0.04 0.04 oxyquinolinesulfate (2) 0.04 0.04 0.04 0.04 0.04 sodium hydroxide or phosphoric acid*4 *4 *4 *4 *4 hydrogen peroxide 5.70 5.70 5.70 5.70 5.70 purified waterin an amount that brings the total amount of the balance balance balancebalance balance second part to 100 anion/cation equivalent ratio of(B)/(A), (B)/(A)′, or (B)′/(A) — — — 2.96 11.47 viscosity of the liquidmixture (25° C., mPa · s) 10 10 10 12 12 evaluation fastness toshampooing based on Comparative Example 4 c c standard c — (a number inparenthesis represents ΔE₀-ΔE₁ (4.0) (4.0) (4.5) (4.3) of eachComparative Example) foaming properties at low temperature a *5 a a astorage stability a a a a a (*1): Merquat 295, the product of NalcoCompany; the mole fraction of cationic monomers was 95%. (*2): Merquat280, the product of Nalco Company; the mole fraction of cationicmonomers was 65%. (*3): Merquat 550, the product of Nalco Company; themole fraction of cationic monomers was 30%. *4: An amount that bringsthe pH of the second part to 3.6. *5: Unmeasurable due to separation

1. A two-part hair dye comprising a first part containing an alkaliagent, a second part containing hydrogen peroxide, and a non-aerosolfoamer container for discharging a liquid mixture of the first part andthe second part in the form of a foam, wherein the liquid mixturecomprises the following components (A) and (B): (A) a polymer orcopolymer containing 70% or more mole fraction of diallyldimethylquaternary ammonium salt monomer, and (B) an N-acylamino acid salt, anN-acyl-N-alkylamino acid salt, or an ether carboxylic acid salt,wherein, an equivalent ratio of an anion site of the component (B) to acation site of the component (A) (anion/cation) is more than 1, and aviscosity of the liquid mixture at 25° C. is 1 to 300 mPa·s.
 2. Thetwo-part hair dye according to claim 1, wherein the Component (A) is acopolymer of a diallyldimethyl quaternary ammonium salt monomer and anacrylic acid or acrylamide monomer.
 3. The two-part hair dye accordingto claim 1, wherein the content of the Component (A) in the liquidmixture is 0.1 to 1.5 mass %.
 4. The two-part hair dye according toclaim 1, wherein the content of the Component (B) in the liquid mixtureis 0.5 to 5 mass %.
 5. The two-part hair dye according to claim 1,further comprising an anionic surfactant other than the Component (B) ora cationic surfactant in an amount of 0 to 1 mass % in the liquidmixture.
 6. The two-part hair dye according to claim 1, furthercomprising an amphoteric surfactant or a nonionic surfactant in anamount of 0.1 to 5 mass % in the liquid mixture.
 7. The two-part hairdye according to claim 1, further comprising an oil agent in an amountof 0.01 to 3 mass % in the liquid mixture.
 8. The two-part hair dyeaccording to claim 1, wherein a pH of the liquid mixture at 25° C. is 8to
 12. 9. A method for dyeing hair comprising discharging the liquidmixture of the two-part hair dye according to claim 1 from a non-aerosoltype foamer container in the form of a foam, applying the liquid mixturein the form of a foam thus discharged to the hair, and then re-foamingthe liquid mixture on the hair.